Membership only protect some pages or areas?

Hi, I've been reading How to Set Up a Free Mini-Course in WordPress and need setting a visit level.

Right now, everyone I have should be public and I will be adding a members only section.

I want to start by adding a visit section, what all non-members can see. When I create the visitor role, and drag pages into the positive section. Should I check all the pages I want visitors to be able to see?

Or is there a better way to go about adding a members only section?

Thanks